In the late Southern Song Dynasty, the political situation was chaotic and buildings were about to collapse, but private business activities were still in full swing. At this time, Quanzhou City's Shipping Department was in the hands of the cannibal Pu Shougeng. In order to find out what was going on in the court, he sent his adopted son Pule, who had just returned from overseas trade, to Lin'an. Pule happily obeyed the order, and by the way, he also took Faxiao Zhudao, who had no money to take the exam, with him. Only his sister Pu happy and Zhu Dao's sister Zhu Zhen were left at home to depend on each other. After the Lin'an incident, Pule continued to do business in the north, hoping to realize his dream of connecting the sea and land lines to the Venice trade route. Zhu Dao donated a small Xiangyang warehouse through Pule to quietly work on his official career. By the time Pule returned south for some reason and appeared in front of Zhu Dao as a grain transporter for the Yuan army, the world of the Southern Song Dynasty had already been turned upside down. After witnessing the offensive and defensive battles in Jiankang, Yangzhou, Changzhou and other places, Pule and Zhu Dao followed the Yuan army into Lin'an with their caravans. By chance, Pule temporarily lost contact with his caravan because he was escorting the two young princes of the fallen Song Dynasty out of Lin'an. From then on, he participated in the reconstruction of the government and army of the fallen Song Dynasty between Wuzhou and Fuzhou. It was not until the Yuan army invaded Fuzhou that he became an envoy of the Song Dynasty. Back in Quanzhou, at this time, his friend and brother Zhu Dao was also trying to persuade Pu Shougeng to surrender in Quanzhou City as the envoy of the Yuan Dynasty. For a time, factors such as brotherhood, son-daughter love, father-son love, family and country, etc. Were entangled, making any decision between the two people feel difficult.